In my apps, i have created table view and displayed the images and the labels in the table view. I have downloaded the image and set the image height into the another class and i have passed the image height value using delegates. In my problem is, heightForRowAtIndexPath method is call very earlier and it never calls again. So how i set the cell height depends on the image height?
//appDelegate.imageHeight - Image height delegate value.
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(the height of the image is --------------------------%f, appDelegate.imageHeight);
In Console:
the height of the image is --------------------------0.000000
the height of the image is --------------------------0.000000
the height of the image is --------------------------0.000000
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(the height of the image is --------------------------%f, appDelegate.imageHeight);
In Console:
the height of the image is --------------------------98.567039
the height of the image is --------------------------300.000000
the height of the image is --------------------------232.288406
}
Is any possible to call the heightforRowAtIndexPath method inside the cellForRowAt method. Because i have set the cell frame size and height depends on the image height. So how can i set the cell height depends on the image height?, please guide me.
Thanks!
heightForRowAtIndexPath method is called before cellForRowAtIndexPath, so you need to know height of images you are displaying in your cells. Maintain the dictionary or array that contains height of images which get passed to this class and use it to set the height of cell accordingly
here are some suggestions UITableView flexible/dynamic heightForRowAtIndexPath
Related
Following is the image i have taken from an app from the App Store:
I have created an app that is using StoryBoard with custom tableview cell. The data is loaded in it from a web service. This is what i want:
1) How can i change the size of the uitableviewcell according to the image? For example if one image is 640*500, then the UITableViewCell will change its size accordingly. If the size if the image is 640*1000, then the cell should change its size accordingly.
2) How can i add the grey coloured border around the tableview cells just like in the image above?
3) How can i add a shadow dropping from the UITableViewCell just like in the image above?
Thanks!
Currently i have a partial answer to your question. Part 2 of the question that is the colored border can be solved by the following code:
[cell.contentView.layer setBorderColor:[UIColor colorWithRed:222/255.0f green:222/255.0f blue:222/255.0f alpha:1.0f].CGColor];
[cell.contentView.layer setBorderWidth:5.0f];
Part-1
The height of the tableviewcell is determined using
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
/*
Get the image size
CGFloat width = myImage.size.width;
CGFloat height = myImage.size.height;
use this to return the height of your cell.
*/
}
Part-2 and Part-3
Use..
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
//This will give you access to the cell being rendered and any customization you want can be done here... You can use the earlier answer for this part.. I havent tried it but should work..
}
Hope this helps..
I have designed UITableViewCell in .xib, and its height and width is :
Retrieving from the Xcode ->Show the size inspector.
Width : 358 Height : 562
TableView Delegate:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 800;
}
What I am trying?
In the following method, i m trying to find width and height of the cell, so that i can draw a vertical line in the cell.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
/* FINDING THE WIDTH AND HEIGHT */
my Custom Cell instance say : cell
cell.contentView.bounds.size.width Give me the value -> 320,
cell.contentView.bounds.size.height Gives me the value -> 44,
}
Question?..
How can i get the correct height/width of the custom cell?
Kindly let know if my understanding is wrong?
You need to override -tableView:willDisplayCell:forRowAtIndexPath:. In this method the correct dimensions are already set up by table view.
I create custom cells within my tableview some have images and are tall some are just text. The height of the cells are calculated in heightForRowAtIndexPath, which I beleive is done before cellForRowAtIndexPath is called. I want to place an imageview at the bottom of the cell regardless of heigh, but I am not sure how to get the calculated height from within cellForRowAtIndexPath?
Too late for an answer..
But, like #user216661 pointed out, the problem with taking the height of the Cell or the ContentView is that it returns the cells original height. Incase of rows with Variable height, this is an issue.
A better solution is to get the Rect of the Cell (rectForRowAtIndexPath) and then get the Height from it.
- (UITableViewCell *)tableView:(UITableView *)iTableView cellForRowAtIndexPath:(NSIndexPath *)iIndexPath {
UITableViewCell *aCell = (UITableViewCell *)[iTableView dequeueReusableCellWithIdentifier:aCellIdentifier];
if (aCell == nil) {
CGFloat aHeight = [iTableView rectForRowAtIndexPath:iIndexPath].size.height;
// Use Height as per your requirement.
}
return aCell;
}
You can ask the delegate, but you'll be asking twice since the tableView already asks and sizes the cell accordingly. It's better to find out from the cell itself...
// in cellForRowAtIndexPath:, deque or create UITableViewCell *cell
// this makes the call to heightForRow... and sizes the cell
CGFloat cellHeight = cell.contentView.bounds.size.height;
// alter the imageView y position (assuming the rest of the frame is correct)
CGRect imageFrame = myImageView.frame;
imageFrame.y = cellHeight - imageFrame.size.height; // place the bottom edge against the cell bottom
myImageView.frame = imageFrame;
You are allowed to call heightForRowAtIndexPath yourself! Just pass the indexPath from cellForRowAtIndexPath as an argument and you can know the height of the cell you are setting up.
Assuming you are using a UITableViewController, just use this inside cellForRowAtIndexPath...
float height = [self heightForRowAtIndexPath:indexPath]
I'd like to know the best strategy for adaptive cell heights. The cells first know how high they will be when they are created (they contain some textboxes and images) in the cellForRowAtIndexPath method.
My idea was to store the cell's height in a NSMutableDictionary with a cell identifiying key.
The problem is that the heightForRowAtIndexPath: method is called before the cells are created and only then.
How do you manage that usually?
If you want to resize your cells (that is - to make heightForRowAtIndexPath method get called) you can use empty beginUpdates - endUpdates block:
[table beginUpdates];
[table endUpdates];
That will force UITableView to update its geometry and cells heights will be updated
If you want to adapt you cell's height, use - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath from the UITableViewDelegate.
Store the cell's height into a NSArray for example and get it thanks to the indexPath parameter.
I do the following now: I calculate the height from the string height directly, I use:
-(CGFloat) estimateCellheightFromText:(NSString*) text andFont:(UIFont*)ffont widthConstraint:(CGFloat)width andLineBreakMode:(UILineBreakMode)lbMode{
CGSize stringSize = [text sizeWithFont:ffont constrainedToSize:CGSizeMake(width, 9999) lineBreakMode:lbMode]; return stringSize.height;}
In the iPhone SDK, is there a way to customize the width of the cells in a tableview that is having the style of UITableViewStyleGrouped?
The problem is that I am using an custom background image (width of 290px) for the cell.backgroundView but apparently that gets stretched. I want to be able to set the custom width of this cell so the background image doesn't stretch.
Just resize the tableView as per your requirement ..........either from Nib or programmatically.....
size of cell depends on the width of table.
because there is not such any method in IPhoneSDK
-(CGFloat)tableView:(UITableView *)tableView widthForRowAtIndexPath:(NSIndexPath *)indexPath
{
// width
return 300;
}
Can you not call the delegate method
-(CGFloat)tableView:(UITableView *)tableView widthForRowAtIndexPath:(NSIndexPath *)indexPath
{
// width
return 300;
}